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[ROM][STOCK]{UPDATED} Lenovo Tab 3 8/TB3-850F Android 6.0 Stock Firmware Images

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MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
Lenovo Tab 3 8/TB3-850F -
Android 6.0 Stock Firmware Images


DISCLAIMER: As always, flashing your device - with either stock or custom firmware - involves an inherent risk of bricking or otherwise rendering your device inoperable. I am not responsible for any good or bad resulting from your use of these firmware images or this thread.

DEVICE SPECIFICATIONS:
Model: Lenovo Tab 3 8"(TB3-850F)
Android Version: 6.0 Marshmallow
Kernel Version: 3.18.19
Board Platform: MediaTek MT6735m (1.0 GHz)
Build No: TB3-850F_S100031_171010_ROW
Software Version: TB3-850F_160412
SDK Version: 23
Build ID: MRA58K
Android Security Patch Level: 9/05/2017
Build Date: 10/10/2017


NOTE:
First & foremost, these partition images will not restore your device completely back to factory/stock condition. They will restore your Android OS, boot logo, boot image & recovery to stock condition. Other vital partitions of your device, such as /lk (the primary bootloader) are not restored by flashing these images. To revert to an unmodified factory state, you will need to visit @r&xp's thread mentioned below and flash your device with stock firmware using the SP Flash Tool, which will also re-lock your bootloader.
This firmware thread is not intended as a tutorial or guide for flashing or restoring your Lenovo Tab 3 back to stock condition. Rather, this is intended as a resource for stock images, device drivers, etc. However, some rudimentary instructions are provided, which will enable you to install these images and restore your device back to mostly stock condition. NOTE: IF YOUR DEVICE IS BRICKED (UNABLE TO BOOT INTO EITHER RECOVERY OR FASTBOOT MODE), THESE FIRMWARE IMAGES WILL BE OF NO BENEFIT. INSTEAD, PLEASE VISIT THE FOLLOWING THREAD BY XDA MEMBER @r&xp , WHICH WILL GIVE YOU THE NECESSARY FILES AND PRECISE INSTRUCTIONS FOR UNBRICKING & RESTORING YOUR DEVICE. https://forum.xda-developers.com/android/help/lenovo-tab-3-8-tb3-850f-unbrick-root-t3598727

There are any number of available procedures to flash these stock partition images to your device. The simplest option is to use a custom recovery like TWRP to flash them. Store these images to your external micro SD (or internal storage if you do not intend to wipe internal storage or format /userdata). In TWRP's main menu, select "WIPE", "ADVANCED WIPE", and select Dalvik Cache, Cache, System, & Data. (For a clean install, it is recommended to format Data as well, by selecting "WIPE", then "Format Data.") Reboot Recovery (often necessary for proper mounting of the data partition). Now, select "INSTALL", then select "INSTALL IMAGE" in the bottom right of the menu, navigate to the storage location of the firmware images, and flash them in any order you choose. If you do not have TWRP installed on your device, XDA Senior Member @Hemphiz has a simple & comprehensive thread here: https://forum.xda-developers.com/android/general/guide-lenovo-tab3-8-tb3-850f-t3559786/page1. In any event, whichever option you choose, please do your homework and research the threads here on XDA relating to your choice. These images may also be installed via fastboot mode. You will need to install Minimal ADB & Fastboot (v1.4 or later) on your PC, ensure the proper Lenovo device drivers & ADB drivers are installed on your PC, and connect your device to your PC via the stock (or quality equivalent) micro USB to USB data sync cable. Once in fastboot mode, open a command prompt in the adb/fastboot directory, and execute the following command lines:

fastboot devices (if you are properly synced, your device serial # will be shown)

fastboot oem fb_mode_set
fastboot flash logo logo.img
fastboot flash boot boot.img
fastboot flash recovery recovery.img (this will overwrite any custom recovery)
fastboot flash system system.img (fastboot will automatically sparsechunk this image)
fastboot erase userdata
fastboot erase cache
fastboot oem fb_mode_clear

fastboot reboot



STOCK PARTITION IMAGES:
The link below provides the following stock firmware images:

/system.........................Size 3.0 GB
/boot..............................Size 16 MB
/recovery........................Size 16 MB
/logo...............................Size 8 MB


Also included in the link are some helpful files like Minimal ADB & Fastboot v1.4.3, the official Lenovo USB Drivers for the TB3-850F (v1.1.21), a general partition index of the tablet, the ADB driver installer for Windows, and the latest PC version of LenovoSuite Mobile Assistant v1.4.1.14199.

I have made a full & complete partition dump of this device, including sensitive firmware partitions such as /oemkeystore, /nvdata, /seccfg, /lk, etc. In the event any members have corrupted these partitions, just request and I will upload these as well. (/nvdata contains device identifiers such as MAC Address, ESN, etc. The device from which these images were taken has since been hardware damaged & salvaged for parts. Therefore, I have no issue with sharing these images. However, as a disclaimer, you are fully responsible for the manner in which you use device ID partitions. Modifying a device's identifiers delves into matters of legality and ethical guidelines, all for which you are solely responsible.)

CREDITS:
Thanks to XDA Senior Member @Hemphiz for his hard work & development on this device, and his thread on TWRP & rooting. Also, huge thanks to @r&xp for his lifesaving tutorial on recovering this device from a soft or hard brick. His guide has revived many devices from the Android cemetery. You guys visiting either of these threads mentioned, be sure and hit the "THANKS" button for their hard work.

DOWNLOAD LINK:
TB3-850F_S100031_171010_ROW
Stock Firmware Partition Images: https://drive.google.com/folderview?id=1vRLwQ2mCD3CwYQZKGHyykDvBd2yGHisT



Sent from my Lenovo Tab 3 8/TB3-850F using XDA Forums Pro Edition.
 
Last edited:

tsaibru

Member
Nov 3, 2011
28
6
Hi:
I have a Tab3 8 TB3-850F which bough in China. It's a 2G+16G version.
I have successfully install TWRP and root.
I'm wondering can I install this ROM to my TAB3?
Thanks!
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
Hi:
I have a Tab3 8 TB3-850F which bough in China. It's a 2G+16G version.
I have successfully install TWRP and root.
I'm wondering can I install this ROM to my TAB3?
Thanks!
I don't see why you couldn't. But, to clarify some info, what is your Build No and Software Version? Look under Settings, About Device
 

tsaibru

Member
Nov 3, 2011
28
6
Build number:
TB3-850F_S100026_161221_PRC

Software version:
TB3-850F-160425

Thank you very much!
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
Build number:
TB3-850F_S100026_161221_PRC

Software version:
TB3-850F-160425

Thank you very much!
Based on your Build & Software Version info, I can see no compatibility issues with this Stock ROM & your device. You seem to simply have a Chinese variant of the TB3-850F that is not available for retail in the United States.
In any event, use TWRP to backup all partitions of your tablet before proceeding henceforth with flashing this ROM. Also, do not flash the stock recovery from my link...keep your TWRP fully intact & accessible in case anything goes south as a result of the flash. Accordingly, you should be able to fully restore your partition backups via TWRP in the event my Stock ROM doesn't boot up. But, like I said, I can see no adverse consequences to flashing it. Should you decide to give it a go, please update us on this thread as to the results.
Thank you...
 

tsaibru

Member
Nov 3, 2011
28
6
The reason why I would like to flash this ROM is to get full Google service which Chinese Rom does not offer.
Even though I have root and install Google service on it. Some of apps I downloaded from play just won't install.

So I dowbloaded this ROM and flash system-002.img, it works.
Now I have all Google service I needed, and all apps I download are able to install.

But after I reset the tab I've build number S100026_160923_ROW, software version TB3-850F_160412.
It will try to download the update to 161209 but after reboot it just go in TWRP not doing anything.
I'm very satisfied with this, and I will keep searching and wait for a way for me to update to S100030_161209_ROW.

I do really appreciate your work to help me solve my problem and save this tab from goes to trash can.
 
The reason why I would like to flash this ROM is to get full Google service which Chinese Rom does not offer.
Even though I have root and install Google service on it. Some of apps I downloaded from play just won't install.

So I dowbloaded this ROM and flash system-002.img, it works.
Now I have all Google service I needed, and all apps I download are able to install.

But after I reset the tab I've build number S100026_160923_ROW, software version TB3-850F_160412.
It will try to download the update to 161209 but after reboot it just go in TWRP not doing anything.
I'm very satisfied with this, and I will keep searching and wait for a way for me to update to S100030_161209_ROW.

I do really appreciate your work to help me solve my problem and save this tab from goes to trash can.

Trying a system update will not work with a custom recovery installed. In spft you can select only to flash the stock recovery then you should be able to update it, when you have done the system update just flash TWRP again.
@MotoJunkie01 I did send you a PM the other day, maybe like for you it did not send or was it my noobishness? :laugh:
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin

Trying a system update will not work with a custom recovery installed. In spft you can select only to flash the stock recovery then you should be able to update it, when you have done the system update just flash TWRP again.

@MotoJunkie01 I did send you a PM the other day, maybe like for you it did not send or was it my noobishness? :laugh:
Try sending another PM please. I could have deleted your PM by mistake.
 

chico2016

Member
May 4, 2017
13
1
boot. logo and recovery.img worked but system.img did not .the system.img downloads with the explorer or e symbol not a disc like the others do.don't know if that has anything to do with it not working? need the system.img to work pls.:confused:
 
Last edited:

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
boot. logo and recovery.img worked but system.img did not .the system.img downloads with the explorer or e symbol not a disc like the others do.don't know if that has anything to do with it not working? need the system.img to work pls.:confused:
Not sure. The /system image is an unmodified dump taken from a brand new TB3-850F. It works for me and other members. Be sure you are running version 1.4 or later on minimal adb & fastboot. That could be your issue.
 
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chico2016

Member
May 4, 2017
13
1
Not sure. The /system image is an unmodified dump taken from a brand new TB3-850F. It works for me and other members. Be sure you are running version 1.4 or later on minimal adb & fastboot. That could be your issue.

ok will try again thank you.

---------- Post added at 01:19 AM ---------- Previous post was at 01:15 AM ----------

is it possible to use the platform tool ,like it says for the twrp for the system image?
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
ok will try again thank you.

---------- Post added at 01:19 AM ---------- Previous post was at 01:15 AM ----------

is it possible to use the platform tool ,like it says for the twrp for the system image?
Sure. Minimal ADB & Fastboot is merely a bare essentials utility in contrast to the Android SDK & other platform tools packages. You may also flash the /system image using TWRP.
 
  • Like
Reactions: chico2016

chico2016

Member
May 4, 2017
13
1
Sure. Minimal ADB & Fastboot is merely a bare essentials utility in contrast to the Android SDK & other platform tools packages. You may also flash the /system image using TWRP.

target reported max download size of 134217728 bytes.
invalid sparse file format at header magi ? Not enough room.
need help with tb3-850f flashing system.img.
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
target reported max download size of 134217728 bytes.
invalid sparse file format at header magi ? Not enough room.
need help with tb3-850f flashing system.img.
If you use minimal adb & fastboot v1.4, the /system image will automatically be converted into a series of smaller sparsechunk image files, which will be flashed to your device one at a time until complete.
 
  • Like
Reactions: chico2016

chico2016

Member
May 4, 2017
13
1
wow dont know what i am doing wrong.
invalid sparse file format at header Magi
erasing 'system'...
okay[0.032s]
sending sparse 'system' 1/21...(129476kb) okay[14.824s] writing 'system'1/21...
failed(remote: uknown chunck type)
finished. total time: 14.904s
need some help adb fastboot file says 'system.img is to long?
 
Last edited:

chico2016

Member
May 4, 2017
13
1
wow dont know what i am doing wrong.
invalid sparse file format at header Magi
erasing 'system'...
okay[0.032s]
sending sparse 'system' 1/21...
failed(remote: uknown chunck type)
finished. total time: 14.904s
need some help adb fastboot file says 'system.img is to long?
 
Last edited:

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
wow dont know what i am doing wrong.
invalid sparse file format at header Magi
erasing 'system'...
okay[0.032s]
sending sparse 'system' 1/21...
failed(remote: uknown chunck type)
finished. total time: 14.904s
need some help adb fastboot file says 'system.img is to long?
What version of Minimal ADB & Fastboot are you using?
 

chico2016

Member
May 4, 2017
13
1
i am using the 1.4 version adb fastboot from the same link i got the images on this very helpful post
boot img -logo.img-recovery.img say flash on ,and the tablet marks ok that they have flashed---but no luck with the system.img even though i have re downloaded twice same thing .do you have a link that would go through a step by step instalation process you could help me with.
 

MotoJunkie01

Senior Member
Apr 2, 2016
2,403
1,213
Corbin
i am using the 1.4 version adb fastboot from the same link i got the images on this very helpful post
boot img -logo.img-recovery.img say flash on ,and the tablet marks ok that they have flashed---but no luck with the system.img even though i have re downloaded twice same thing .do you have a link that would go through a step by step instalation process you could help me with.
I don't have a tutorial posted per se on installation. Here's a thought. Boot your tablet into TWRP (fastboot boot TWRP.img) and flash my system.img via TWRP. In TWRP main menu select INSTALL, then select the .img file option in bottom right hand corner of screen. (You will need to put the system.img on an ext micro SD)
 

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  • 8
    Lenovo Tab 3 8/TB3-850F -
    Android 6.0 Stock Firmware Images


    DISCLAIMER: As always, flashing your device - with either stock or custom firmware - involves an inherent risk of bricking or otherwise rendering your device inoperable. I am not responsible for any good or bad resulting from your use of these firmware images or this thread.

    DEVICE SPECIFICATIONS:
    Model: Lenovo Tab 3 8"(TB3-850F)
    Android Version: 6.0 Marshmallow
    Kernel Version: 3.18.19
    Board Platform: MediaTek MT6735m (1.0 GHz)
    Build No: TB3-850F_S100031_171010_ROW
    Software Version: TB3-850F_160412
    SDK Version: 23
    Build ID: MRA58K
    Android Security Patch Level: 9/05/2017
    Build Date: 10/10/2017


    NOTE:
    First & foremost, these partition images will not restore your device completely back to factory/stock condition. They will restore your Android OS, boot logo, boot image & recovery to stock condition. Other vital partitions of your device, such as /lk (the primary bootloader) are not restored by flashing these images. To revert to an unmodified factory state, you will need to visit @r&xp's thread mentioned below and flash your device with stock firmware using the SP Flash Tool, which will also re-lock your bootloader.
    This firmware thread is not intended as a tutorial or guide for flashing or restoring your Lenovo Tab 3 back to stock condition. Rather, this is intended as a resource for stock images, device drivers, etc. However, some rudimentary instructions are provided, which will enable you to install these images and restore your device back to mostly stock condition. NOTE: IF YOUR DEVICE IS BRICKED (UNABLE TO BOOT INTO EITHER RECOVERY OR FASTBOOT MODE), THESE FIRMWARE IMAGES WILL BE OF NO BENEFIT. INSTEAD, PLEASE VISIT THE FOLLOWING THREAD BY XDA MEMBER @r&xp , WHICH WILL GIVE YOU THE NECESSARY FILES AND PRECISE INSTRUCTIONS FOR UNBRICKING & RESTORING YOUR DEVICE. https://forum.xda-developers.com/android/help/lenovo-tab-3-8-tb3-850f-unbrick-root-t3598727

    There are any number of available procedures to flash these stock partition images to your device. The simplest option is to use a custom recovery like TWRP to flash them. Store these images to your external micro SD (or internal storage if you do not intend to wipe internal storage or format /userdata). In TWRP's main menu, select "WIPE", "ADVANCED WIPE", and select Dalvik Cache, Cache, System, & Data. (For a clean install, it is recommended to format Data as well, by selecting "WIPE", then "Format Data.") Reboot Recovery (often necessary for proper mounting of the data partition). Now, select "INSTALL", then select "INSTALL IMAGE" in the bottom right of the menu, navigate to the storage location of the firmware images, and flash them in any order you choose. If you do not have TWRP installed on your device, XDA Senior Member @Hemphiz has a simple & comprehensive thread here: https://forum.xda-developers.com/android/general/guide-lenovo-tab3-8-tb3-850f-t3559786/page1. In any event, whichever option you choose, please do your homework and research the threads here on XDA relating to your choice. These images may also be installed via fastboot mode. You will need to install Minimal ADB & Fastboot (v1.4 or later) on your PC, ensure the proper Lenovo device drivers & ADB drivers are installed on your PC, and connect your device to your PC via the stock (or quality equivalent) micro USB to USB data sync cable. Once in fastboot mode, open a command prompt in the adb/fastboot directory, and execute the following command lines:

    fastboot devices (if you are properly synced, your device serial # will be shown)

    fastboot oem fb_mode_set
    fastboot flash logo logo.img
    fastboot flash boot boot.img
    fastboot flash recovery recovery.img (this will overwrite any custom recovery)
    fastboot flash system system.img (fastboot will automatically sparsechunk this image)
    fastboot erase userdata
    fastboot erase cache
    fastboot oem fb_mode_clear

    fastboot reboot



    STOCK PARTITION IMAGES:
    The link below provides the following stock firmware images:

    /system.........................Size 3.0 GB
    /boot..............................Size 16 MB
    /recovery........................Size 16 MB
    /logo...............................Size 8 MB


    Also included in the link are some helpful files like Minimal ADB & Fastboot v1.4.3, the official Lenovo USB Drivers for the TB3-850F (v1.1.21), a general partition index of the tablet, the ADB driver installer for Windows, and the latest PC version of LenovoSuite Mobile Assistant v1.4.1.14199.

    I have made a full & complete partition dump of this device, including sensitive firmware partitions such as /oemkeystore, /nvdata, /seccfg, /lk, etc. In the event any members have corrupted these partitions, just request and I will upload these as well. (/nvdata contains device identifiers such as MAC Address, ESN, etc. The device from which these images were taken has since been hardware damaged & salvaged for parts. Therefore, I have no issue with sharing these images. However, as a disclaimer, you are fully responsible for the manner in which you use device ID partitions. Modifying a device's identifiers delves into matters of legality and ethical guidelines, all for which you are solely responsible.)

    CREDITS:
    Thanks to XDA Senior Member @Hemphiz for his hard work & development on this device, and his thread on TWRP & rooting. Also, huge thanks to @r&xp for his lifesaving tutorial on recovering this device from a soft or hard brick. His guide has revived many devices from the Android cemetery. You guys visiting either of these threads mentioned, be sure and hit the "THANKS" button for their hard work.

    DOWNLOAD LINK:
    TB3-850F_S100031_171010_ROW
    Stock Firmware Partition Images: https://drive.google.com/folderview?id=1vRLwQ2mCD3CwYQZKGHyykDvBd2yGHisT



    Sent from my Lenovo Tab 3 8/TB3-850F using XDA Forums Pro Edition.
    4
    Hoping my custom ROM for this device will be finished tonight. Ironing out my uodater-script now
    4
    I finally compiled a TWRP flashable unmodified Android 6.0 stock ROM for this tablet. Here is the thread link. Custom ROM is nearly finished too.
    https://forum.xda-developers.com/android/general/rom-lenovo-tab-3-8-tb3-850f-t3617594
    3
    The fact you're just stuck in a bootloop is a good sign that you can hopefully recover from. I am unsure of how the stock rom on this thread is flashed (zip with twrp?) so in the link below is the link to the stock rom(850F only) that I previously used thanks to @pndwal for finding it.

    https://forum.xda-developers.com/showpost.php?p=71226040&postcount=66

    The file you download has everything you need from the stock rom with scatter file, drivers and SPFT.
    Like @MotoJunkie01 said above you will need to hold the volume down button when connecting to the Pc for the Vcom driver to install. For the DA (download agent) in Spft where you select the scatter file use the DA with "all in one" in the name.
    Also make sure you press "download" on Spft before connecting the tablet to the computer.
    This stock firmware consists of four stock partition images (system, boot, recovery & logo). These images may be flashed in a number of ways, including fastboot, TWRP, or on-device flashing apps like Flashfire.
    3
    Just updated this thread to the most recent Stock 6.0 firmware images. I've included updated driver files in the link and have included some basic instructions for fastboot flashing the firmware images using a PC. Download link now provides /system, /recovery, /logo and /boot partitions from Android 6.0 Build No. TB3-850F_S100030_161209_ROW.